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A. DIGKERMAN.

BRBEGH LOADING FIRE ARM. No. 354,890. Patented Dec. 28, 1886.

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A. DIOKERMAN.

BREBGH LOADING FIRE ARM. No. 354,890 Patented Dec. 28, 1886.

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UNITED STATES AMOS DICKERMAN, OF NEW HAVEN, CONNECTICUT, ASSIGNOR OFONE-HALF PATENT OFFICF.

TO CORNELIUS PIERPONT, OF SAME PLACE.

BREECH-LOADING FIRE-ARM.

i SPECIFICATION forming part of Letters Patent No. 354.890, datedDecember 28, 1886.

Application filed June 30, 1866. Serial No. 906,743. (No model.)

To all whom it may concern.-

Be it known that I, Amos DIOKERMAN, a citizen of the United States,residing in New Haven and Stateof Connecticut, haveinvented a new anduseful 'Improvement in Breech- Loading Fire-Arms, of which the followingis a specification.

My invention relates to that class of breechloading fire-arms in whichthe hammer is inclosed with the firing mechanism and operated by anexternal lever which disengages the barrel from the breech-block.

The improvement consists in the novel construction and arrangement ofthe hammer and safety-plate and their operating-cams, and in the meansfor limiting theswing of the barre1,as hereinafter more fully describedand claimed.

In the accompanying drawings,- Figure 1 is a side view of thebreech-block or receiver of my improved fire-arm with its cover orcapplate removed, and Fig. 2 is a view of the same without thesafetyplate, and showing the cam-shaft thrown back. Fig. 3 is a front orface view of the hammer. Fig. 4 is a horizontal section on the line 0:,Fig. 2. Fig. 5 is a view of the safety-plate, and Fig. 6 is a plan viewof the trigger and safety-plate. Fig. 7 shows part of the breech-blockwith the barrel swung open therefrom. Fig. Sis a plan vie of the part ofthe breech-block in which the barrel is hinged; and Fig. 9 shows a transverse section of the barrel on the line :0, Fig. 7.

Referring to the drawings, A designates the breech-block orreceiver,which isrecessed in the usual manner to form a case for thereception of the hammer and other parts of the lock. The hammer Bispivoted upon a stud or pin, 0, Secured in the side of the caseorreceiver, and is adapted to oscillate or swinglengthwise thereof, withthe striking part or head uppermost and in line with the firing-pin e.The hammer is actuated by a looped maiuspring, 9, arranged in the rearpart of the receiver, with th per and longer arm connected by a link, itto ouble forked o'r divided spur or hook, f, on the rear side of thehammer, near thepivot O. The trigger notches or bentsz' are formed inthe lower edge of the hammer, directly beneath the pivot. The trigger Dis pivoted to the side of the receiver under the mainspring,

and has a rear arm, n, upon which the lower or short arm of themainspring bears, thus serving both as trigger-spring and hammerspring.The trigger has a projecting arm or pointedspur, m, which extendsforward under the hammer, and is adapted to springinto the trigger-bentsz',operated by the force of the maiuspring.

The trigger-arm'm is about half as wide as the space in thereceivercase, and rests against the back wall thereof, and the lowerpart of the hammer is formed of corresponding width, as shown in Fig. 3.Aprojecting lip or ledge, 1', is formed on the front side of the triggerintegral with the arm m, and a safety-plate, t, is

forward by means of the finger which pulls the trigge I Thesafety-plate, with its neck and knob,

are formed in one piece,which is placed in the case when the cover isremoved, and held in position by the cover 'when it isscrewed down uponthe case. Two inclines, 0, are formed in the safety-plate on the sideadjacent to the receiver-cover, and a spring, 11, is secured at one endto the trigger and adapted to bear at its opposite end upon the inclineson the platei The forward incline is made of such an angle that thepressure of the spring upon it draws the plate backward, and the rearincline is made'so steep that the spring, when acting thereon, will holdthe plate forward. The plate is made of suflicient thickness to exactlyfillthe space between the ledge and the, bottom wall of the case whenthe hammer is cooked, the trigger-bents being so formed that the arm mis at its highest point at such posi- 5 tion.

L represents the vertical cam-shaft journaled in the case, which carriesthe cams for operating the lock mechanism.

I represents the bolt which locks the barrel 1o:

and breech-lock, and is disengaged by the action of-the cam or arm Cwhen the cam-shaft is thrown'back, as shown in Fig. 2.

The cam-shaft is operated by means of the external lever, E, upon theupper side of the breech-block. The hammer is cooked by cam or arm wonthe cam-shaft just below the'firingpin. The face of the hammer where thecam engages it is beveled, as shown at y in Figs. 3 and 4, to insure aneasy lift of the hammer, and the friction of the cam on the hammer isreduced bya suitable friction-roll,w'. A earn, 0', is carried at thelower end of the cam-shaft, and is adapted to throw the safety-platebackward until the highest part of the inclines 0 passes under the endof the spring 10. The shaft carriesa cam, d, at its upper end, engagedby a spring, 0, which returns the carnshaft to its forward positionautomaticall after the gun has been cocked. 4

Fig. 7 shows the barrel ofthe gun hinged to the breech-block and swungopen. The tongue or part m, which has the bolt-notches n, is formed witha countersink or recess, 0", in one side, and a pin,-u is insertedthrough the side of the breechblock, with its end received in therecess. The pin limits the movement of the barrel when its breech end isswung upward to insert the cartridge. The

recess may be milled into thetongne m, which is not thereby materiallyweakened.

In operation, as the cam shaft is turned backward to the position shownin Fig. 2 the cam w cooks the hammer, the cam G withdraws thebarrel-bolt I and disengages the barrel to permit the insertion of thecartridge, and the cam 1- throws the safety-plate t backward until thespring prests upon the forward incline, o. The spring then draws theplate under the ledge 1' at the instant that the trigger-arm mspringsinto the rear bent, i, on the hammer. When the leverE is released, thespt'ing e returns the cam-shaft to place. In this position the gun iscocked, but cannot be fired until the safety-plate is pressed forward.

from under the trigger-ledge, which action maybe performed by the fingerwhich operates the trigger.

I claim as new, and desire to secure by Letters Patent- In combinationwith the trigger and the trigger-locking plate provided with theinclines o 0, substantially as described, the spring carried by thetrigger and having its end so situated as to engage the inclines on theplate, substantially as and for the purpose described.

AMOS DICKERMAN.

- Witnesses:

WALTER POND,

JONATHAN W. Porn).

